1: diethoxyphosphoryl-acetic acid ethyl ester With potassium tert-butylate in 1,4-dioxane T=20°C; 0.666667 h; 2: cyclohexenon in 1,4-dioxane 6 h; Heating; Further stages. Title compound not separated from byproducts.;

2: anhydrous K2CO3 / xylene / 1 h / Heating View Scheme

pyridine; thionyl chloride 1.) CH2Cl2, 0 deg C, 1.5 h; 2.) 295 deg C, without solvent, 4 h; Yield given. Multistep reaction. Yields of byproduct given;

1,8-diazabicyclo[5.4.0]undec-7-ene 1.) benzene, 1 h, reflux; 2.) 295 deg C, without solvent, 4 h; Yield given. Multistep reaction. Yields of byproduct given;